Advantages of Heterojunction Solar Cells over Conventional Crystalline Silicon Cells

"The way to improve the conversion efficiency of heterojunction solar cells is the same as that of traditional crystalline silicon cells, and it is also considered to reduce optical loss and electrical loss. So what are the advantages of heterojunction solar cells compared with traditional crystalline silicon cells?"

Structural symmetry
The heterojunction cell is to deposit the intrinsic layer, doped layer, TCO and printed electrodes on both sides of the single crystal silicon wafer respectively. Such a symmetrical structure facilitates the reduction of process equipment and steps. Compared with traditional crystalline silicon solar cells, the process steps of heterojunction cells are fewer.

low temperature process
Since heterojunction solar cells use silicon-based thin films to form pn junctions, the highest process temperature is the formation temperature of amorphous silicon thin films (~200°C), thus avoiding the high temperature (~900°C) of traditional thermal diffusion crystalline silicon solar cells to form pn junctions. ℃). The low-temperature process can save energy, reduce thermal damage and deformation of silicon wafers, and use thin silicon wafers as substrates, which is beneficial to reduce material costs.

high open circuit voltage

The heterojunction cell is an intrinsic thin film i-a-Si:H inserted between crystalline silicon and doped thin film silicon, which can effectively passivate the defects on the surface of crystalline silicon, so the open circuit voltage of the heterojunction cell is higher than that of the conventional cell . Heterojunction cells can achieve higher photoelectric conversion efficiency.

good temperature characteristics

Due to the high open circuit voltage, the temperature coefficient of the heterojunction solar cell is reduced, which makes it have a better output than the conventional cell under the condition of light temperature rise. And because of the amorphous silicon thin film in the battery structure, the heterojunction solar cell has the advantages of a thin film battery, and its weak light performance is better than that of a conventional battery.

good light stability

Theoretical research shows that the staebler-wronski effect is not found in the amorphous silicon thin film in the heterojunction solar cell, so there will not be a phenomenon similar to the degradation of conversion efficiency due to light in the amorphous silicon thin film cell.

Meineng cell light attenuation chamber uses xenon arc lamps that can simulate the full sunlight spectrum to reproduce the destructive light waves that exist in different environments, and can provide corresponding environmental simulation and accelerated tests for photovoltaic cell product development and quality control.

double-sided power generation

Due to the symmetrical structure of the heterojunction solar cell, both the front and back sides can generate electricity after receiving light. After being packaged into a double-sided battery module, the average annual power generation is more than 10% more than that of a single-sided battery module.

Heterojunction solar cells have a wide range of applications, and are widely used in solar panels, public transportation, communication equipment, power installation projects, national defense technology and other fields. Heterojunction solar cells play an important role that cannot be missed. Because of its various advantages, it has become the industry-recognized ultimate solution for future photovoltaic cell technology, and it is the only direction for photovoltaic cells to upgrade within 5 years.